Date: Wed, 16 Mar 2011 14:43:42 GMT From: Heribert Steuer <steuer@unixsystems.de> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/155606: select() does not return EBADF on closed file descriptor Message-ID: <201103161443.p2GEhg3H005370@red.freebsd.org> Resent-Message-ID: <201103161450.p2GEo86V013347@freefall.freebsd.org>
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>Number: 155606 >Category: misc >Synopsis: select() does not return EBADF on closed file descriptor >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Mar 16 14:50:08 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Heribert Steuer >Release: 8.1-RELEASE >Organization: >Environment: FreeBSD opusv2p.lr.invalid 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:55:53 UTC 2010 root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386 >Description: I have tracked down a problem that came up while using the quickfix C++ library on a FreeBSD 8.1 server. We found that the select() system call does not return with a value < 0 and errno set when called on a closed socket. This seems to be related to a threaded environment. Our logs stated, that this happens, whenever a thread context switch occurs between the close() and the select() system calls. If there is no context switch in between, select() returns -1 and errno is set to 9. This is the expected behaviour. The process is reproducable. Unfortunately I cannot provide example code to reproduce this scenario. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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